Combined channel-modified adaptive array MMSE canceller and Viterbi equalizer for interferers with delay spread

We build on our previously reported concepts (see Friedman and Bar-Ness, Proc. Vehicular Technology Conf. (VTC), p.209-13, 2001) by investigating the performance of the canceller/MLSE when both desired and interfering signals are subject to multipath. In the earlier paper, it was shown that this very simple scheme, which couples a maximum-likelihood sequence estimator with an N-element canceller, is a receiver structure capable of canceling N-1 non-dispersive in-band interferers without compromising temporal equalization. The method makes use of the MLSE´s channel estimator to modify the locally generated training sequence used to obtain the antenna array weights. This increases the array´s degree of freedom for interference cancellation by allowing the dispersive-desired signal to pass through the array undisturbed. Temporal equalization of the desired signal is then accomplished using maximum-likelihood sequence estimation. The T-spaced channel estimator coefficients and the array weights are obtained simultaneously using minimum mean square error criteria.